CONTENTS MULTIPOINT INJECTION (MPI) 2 . . . . . . .
Contents
1. Terminal Check item Check condition Engine condition Normal condition No 21 Fan motor relay LOW Fan not operating coolant temperature 90 C or Battery voltage below Fan at low speed coolant temperature 90 100 C O 3V 22 A C relay e Engine Idling Battery voltage or 6 V e A C switch OFF to ON Compressor is being or more instanta driven neously to 0 3 V 33 Alternator G terminal e Engine Warm idle radiator fan OFF Voltage rises by 0 2 e Headlamp OFF to ON 3 5 V e Brake lamp OFF to ON e Rear defogger switch OFF to ON 36 Engine warning lamp Ignition switch OFF ON 0 3 V 5 Battery voltage After several seconds have elapsed 37 Power steering fluid Engine Idling after When steering wheel is Battery voltage pressure switch warming up stationary When steering wheel is 0 3V turned 38 Control relay Ignition switch OFF Battery voltage Ignition switch ON 0 3V 39 Fuel pump relay No 2 While engine is idling suddenly depress the Momentarily rises accelerator pedal slightly from 0 to 3 V 40 Exhaust temperature Ignition switch OFF to ON 0 3 V to battery warning lamp voltage After several seconds have elapsed 41 Alternator FR terminal e Engine Warm idle radiator fan OFF Voltage drops by 0 2 e Headlamp OFF to ON 3 5 V e Brake lamp OFF to ON e Rear defogger switch OFF to ON 45 A C switch Engine Idle speed Turn the A C switch OFF 0 3 V2. MPI Troubleshooting 13 11 Code No 22 Crank angle sensor system Probable cause Range of Check e Malfunction of the crank angle sensor e Engine is cranking e Improper connector contact open circuit or Set conditions short circuited harness wire of the crank angle sensor e Sensor output voltage does not change for 4 seconds no pulse signal input e Malfunction of the engine ECU Measure at the crank angle sensor connector A 51 I gt Replace the engine ECU e Connect the connector Use the test harness MD998478 e Voltage between 2 black clip and earth Engine cranking OK 0 4 4 0 V e Voltage between 2 black clip and earth Engine idling 1 5 2 5 V yNG 1 NG Measure at the crank angle sensor connector A 51 __ Check the harness wire between the crank angle sensor and the e Disconnect the connector and measure at the harness side control relay connector and repair if necessary 1 Voltage between 3 and earth Ignition switch ON OK System voltage 2 NG 1 NG _ Check the following con Repair 2 Voltage between 2 and earth Ignition switch ON nector B 62 OK 4 8 5 2 V 3 Continuity between 1 and earth 3 NG OK OK Continuity Check trouble symptom OK T NG NG Check the following con Repair 1 NG nector A 51 Check the harness wire
3. Repair connectors A 110 A 111 OK Y Check trouble symptom NG Y Check the following items e Check the spark plugs and spark plug cables e Check the compression pressure OK Y Check trouble symptom NG Y Check the harness wire between the ignition coil and ignition switch connector and repair if necessary NG Check the following Repair connector B 59 OK Y Check trouble symptom NG x NG Check the harness wire Repair between the engine ECU and ignition coil connec tor Replace the engine ECU Check the harness wire between the ignition coil connector and earth and repair if necessary 13 16 MPI Troubleshooting Probable cause Code No 64 Alternator FR Terminal System Range of Check e Engine speed is approximately 50 r min or more Set conditions e Input voltage at the alternator FR terminal is 4 5 V or more for 20 seconds Open circuit in alternator FR terminal circuit e Malfunction of the engine ECU Measure at the alternator connec tor e Connect the connector Usetestharness MB991519 e Voltage between 4 blue clip and earth Engine Idling Radiator fan Stopped Headlamp OFF ON Brake lamp OFF ON Rear defogger switch OFF ON OK Voltage drops by 0 2 to 3 5 V je
4. Repair the engine ECU and the baromet Y NG ric pressure sensor connector Measure at the engine ECU con Check the harness wire between nector 62 the engine ECU and the baromet e Connect the connector ric pressure sensor connector and Replace the air flow sensor e Voltage between 85 and earth repair if necessary Ignition switch ON OK 3 7 4 3V Altitude 0 m 3 2 3 8 V Altitude 1 200 m OK NG Check the following connec gt Repair tors A 25 B 62 OK Y Check trouble symptom NG Y Replace the engine ECU 13 14 Code No 31 Detonation sensor system MPI Troubleshooting Probable cause Range of Check e Ignition switch ON e Excluding 60 seconds after the ignition switch is turned to ON or immediately after the engine starts e Engine speed is approx 5 000 r min or more Set conditions The change in the detonation sensor output voltage detonation sensor peak voltage ateach 1 2 revolution of the crankshaft is less than 0 06 V for 200 times in succession Malfunction of the detonation sensor Improper connector contact open circuit or short circuited harness wire of the detonation sensor circuit Malfunction of the engine ECU NG Measure at the detonation sensor con nector A 96 e Disconnect the connector measure at the harness side e Continuity between 2 and earth OK Continuity and OK e Check th
5. Replace the engine ECU NG NG m gt Repair NG E m gt Repair NG Measure at the alternator connec 1 Check the following connec tor A 05 tors e Disconnectthe connector and B 60 A 88 measure at the harness side OK e Voltage between 4 and earth Y Ignition switch ON OK 48 52 V Check trouble symptom NG OK Y Check the harness wire between the engine ECU and alternator connector Y OK m Repair Check the following connector A 05 OK Y Check trouble symptom NG Y Check the harness wire between the engine ECU and alternator connector Replace the alternator Replace the engine ECU NG m gt Repair MPI Troubleshooting 13 17 4 PROBLEM SYMPTOMS TABLE Items Symptom Starting Won t start The starter is used to crank the engine but there is no combustion within the cylinders and the engine won t start Fires up and dies There is combustion within the cylinders but then the engine soon stalls Hard starting Engine starts after cranking a while Idling Rough idle Engine speed doesn t remain constant and changes at idle stability Hunting Usually a judgement can be based upon the movement of the tachometer pointer and the vibration transmitted to the steering wheel shift lever body etc This is called rough idle or hunting Inc
6. MD998463 Test harness e Inspection of idle speed control servo 6 pin square e Inspection using an oscilloscope MD998478 Test harness e Measurement of voltage during trouble 8 pin triangle shooting e Inspection using an oscilloscope MD998706 Injector test set Checking the spray condition of injectors MD998741 Injector test adaptor MB991607 Injector test LA 7 MPI Special Tools 13 5 Tool Number Name Use MD998746 Clip Checking the spray condition of injectors MD998709 Adaptor hose Measurement of fuel pressure MD998742 Hose adaptor 991637 Fuel pressure gauge set MB991223 Inspection test Measurement of terminal voltage herness set Red harness e Pin contact pressure inspection harness e Market tester White harness contact probe for general connectors MB991529 Diagnostic trouble Reading of diagnosis codes code check har ness B991529 MB991 709 Test harness e Measurement of voltage during trouble shooting e Inspection using an oscilloscope 13 6 MPI Troubleshooting TROUBLESHOOTING 1 DIAGNOSIS FUNCTION 1 1 ENGINE WARNING LAMP CHECK ENGINE LAMP If an abnormality occurs in any of the following items related to the Multipoint Fuel Injection MPI system the engine warning lamp will illuminate If the lamp remains illuminated or if the lamp illuminates while Engine warning lamp the engine is running check the diagnosis
7. 72 92 Intake air temperature sensor 5 3 6 7 kO When intake air temperature is 0 C 2 3 3 0 kQ When intake air temperature is 20 C 1 0 1 5 When intake air temperature is 40 C 0 30 0 42 kQ When intake air temperature is 80 C High temperature sensor 3 Q or less 6 12 11 12 Engine coolant temperature sensor 5 1 6 5 kQ When coolant temperature is 0 C 0 9 1 3 kQ When coolant temperature is 40 C 0 26 0 36 kQ When coolant temperature is 80 C 2 1 2 7 kQ When coolant temperature is 20 C Idle position switch Continuity established when throttle valve is at idle position No continuity when throttle valve is slightly open 91 Body earth Continuity established 13 26 MPI Troubleshooting 7 INSPECTION PROCEDURE USING OSCILLOSCOPE 7 1 AIR FLOW SENSOR AFS Observing waveforms displayed on the oscilloscope allows you to visually identify possible unusual disturbances in waveform that could temporarily occur in the air flow sensor output lt Measurement procedure gt 1 Disconnect the air flow sensor connector and connect the special tool Test Harness MB991709 to it Ensure that all terminals are connected 2 Connect the oscilloscope probe to terminal no 3 of air flow sensor connector NOTE If the engine ECU connector is used connect the oscilloscope probe to terminal no 9
8. Repair betweenthe engine ECU and yor the crank angle sensor Check trouble symptom ne yok Replace the crank angle sensor een ie eeu L Check the harness wire between the crank angle sensor and the earth and repair if necessary Code No 23 Camshaft position sensor system Probable cause Range of Check e Malfunction of the camshaft position sensor e Ignition switch ON e Improper connector contact open circuit or e Engine speed is approx 50 r min or more short circuited harness wire of the camshaft position Set conditions sensor circuit e Sensor output voltage does not change for 4 seconds no pulse signal input e Malfunction of the engine ECU Measure at the camshaft position sensor connector A 97 I gt Replace the engine ECU e Connect the connector e Voltage between 2 and earth Engine cranking OK 0 4 3 0 V e Voltage between 2 and earth Engine idling OK 0 5 2 0 V NG 1 NG Measure at the camshaft position sensor connector A 97 __ Check the harness wire between the camshaft position sensor e Disconnect the connector and measure at the harness side and the control relay connector and repair if necessary 1 Voltage between 3 and earth Ignition switch ON OK System voltage 2 NG NG Bea gt Check the following con Repair 2 Voltage
9. 1V E Power supply voltage TIME DIV 0 5 ms ms 7FUO891 Misc n Engine speed Idle lt Explanation on waveform gt The power supply voltage is being normally applied and when a signal is received from the engine ECU the voltage drops to around 0 V for the period of time equivalent to its drive signal When the signal from the engine ECU turns OFF the counter emf of the coil causes a voltage peak to develop thus resuming the power supply voltage Injector drive time The fuel injection time as determined by the engine ECU according to the output values of sensors including AFS Injector drive time effective injection time invalid injection time Invalid injection time corrects operation time lag caused by a power supply voltage drop Solenoid coil counter emf When the signal from the engine ECU turns OFF counter emf occurs in the injector coil approx 65 to 75 V Power supply voltage The power supply voltage is being applied in the absence of a signal from the engine ECU If this voltage is low it extends the invalid injection time and thus the drive time lt Waveform observation points gt Point A Strength of solenoid coil counter emf Solenoid coil counter emf is low or zero Injector solenoid shorting Point B Injector drive time When the engine is suddenly raced the drive time temporarily extends by a wide margin and soon returns to the normal drive time corresponding to the engine speed Duri
10. Turn down one turn after the fixed SAS has touched the throttle lever lt EVOLUTION V gt Turn down 1 1 4 turns after the fixed SAS has touched the throttle lever 3 BASIC IDLE SPEED ADJUSTMENT The basic idle speed should be 850 50 rpm 4 FUEL PRESSURE MEASUREMENT The fuel pressure gauge should be installed at the location shown on the left MPI On vehicle Service 13 31 5 MPI SYSTEM COMPONENTS LAYOUT Name Symbol Name Symbol A C switch Q Exhaust temperature warning lamp S A C relay H Fuel pressure control valve A Airflow sensor with a built in intake airtemperature F Ignition coil and power transistor unit L sensor and barometric pressure sensor Injector B Camshaft position sensor ISC servo D Control relay and fuel pump relay Oxygen sensor K Coolant temperature sensor Power steering fluid pressure switch Detonation sensor Throttle position sensor with a built in idle switch D Crank angle sensor Secondary air control solenoid valve N Diagnosis connector Engine ECU Vehicle speed sensor T Engine warning lamp Wastegate solenoid valve G 9 9 BAG H Oxocmuz n 6FU2658 6FU2659 13 32 MPI On vehicle Service Equipment sideconnector 22200 6 INTAKE AIR TEMPERATURE SENSOR 2 1 Disconnect the air flow sensor connector Measure resistance between terminals 5 and 6 Standard value 2 3 3 0 kQ at 20
11. m Removal steps 1 Injector connector 7 Fuel return pipe 2 PCV hose connection 8 Delivery pipe A 3 High pressure fuel hose connection 9 Insulator 4 Fuel return hose connection 10 Insulator 5 Vacuum hose connector A pAd 11 Injector A 6 Fuel pressure regulator 12 Grommet MPI Throttle Body 13 37 THROTTLE BODY REMOVAL AND INSTALLATION Pre removal Operation Post installation Operation 1 Engine Coolant Draining 1 Strut Tower Bar Installation 2 Air Hose D Removal 2 Air Hose D Installation Refer to GROUP 15 Intercooler Refer to GROUP 15 Intercooler 3 Strut Tower Bar Removal 3 Engine Coolant Supplying 4 Accelerator Cable Adjustment 03 0065 Unit Nm kgf m Removal steps 1 Accelerator cable connection 5 Water hose connection 2 Throttle position sensor connector 6 Throttle body 3 Idle speed control servo connector pAdq 7 Throttle body gasket 4 Vacuum hose connection INSTALLATION SERVICE POINT A lt THROTTLE BODY GASKET INSTALLATION Place the gasket so that the projecting part is positioned as shown in the illustration and then install it between the intake manifold and the throttle body Towards front f vehicl of vehicle e
12. Also called Dieseling Figure 1 Hesitation Normal Vehicle Initial accel speed erator pedal depression Figure 2 13 18 5 SERVICE DATA LIST lt EVOLUTION IV gt MPI Troubleshooting Item Inspection Inspection contents Normal condition No item 11 Oxygen Engine After having been warmed When at 4 000 r min engine is 200 mV or less sensor up suddenly decelerated Air fuel mixture is made leaner when decelerating and is made richer When engine is suddenly 600 1 000 mV when racing raced Engine After having been warmed Engine is idling 400 mV or less up The oxygen sensor signal is used to Changes check the air fuel mixture ratio and 2 500 r min control condition is also checked by 600 1 000 mV the ECU 12 Air flow e Engine coolant temperature Engine is idling 17 43 Hz sensor 80 95 C e Lamps electric cooling fan and 2 500 r min 46 86 Hz all accessories OFF e Transmission Neutral Engine is raced Frequency increases in response to racing 13 Intake air Ignition switch ON or with engine When intake air temperature 20 C temperature running is 20 C sensor When intake air temperature 0 C is 0 C When intake air temperature 20 C is 20 C When intake air temperature 40 C is 40 C When intake air temperature 80 C is 80 C 14 Throttle Ignition switch ON Set to idle position 300 1 000 mV
13. At altitude of 1 800 m 81 kPa 26 Idle position Ignition switch ON Throttle valve Set to idle ON switch Check by operating accelerator position pedal repeatedly 1 Throttle valve Slightly open OFF 27 Power Engine Idling Steering wheel stationary OFF steering fluid en Steering wheel turning ON 28 A C switch Engine Idling A C switch OFF OFF when A C switch is ON A C compressor should be operating A C switch ON ON 13 20 MPI Troubleshooting Item Inspection Inspection contents Normal condition No item 41 Injector Engine Cranking When engine coolanttemper 27 41 ms drive time ature is 0 C injection is carried out for all cylinders simultaneously When engine coolanttemper 14 22 ms ature is 20 C When engine coolanttemper 3 9 5 9 ms ature is 80 C Injector e Engine coolant temperature Engine is idling 1 2 2 4 ms drive time 80 95 C e Lamps electric cooling fan and 2 500 r min 1 0 2 2 ms all accessories OFF e Transmission Neutral When engine is suddenly Increases raced 44 Ignition e Engine After having been Engine is idling 3 13 BTDC advance warmed up e Timing lamp is set The timing lamp is set in order to check 2 500 r min 24 44 BTDC actual ignition timing 45 ISC e Engine coolant temperature A C switch OFF 2 25 steps stepper 80 90 C motor e Lamps electric cooling fan and
14. below Terminal Check item Check condition Engine condition Normal condition No 1 No 1 injector While engine is idling after having been warmed up Momentarily drops suddenly depress the accelerator pedal slightly from 11 14 V 14 No 2 injector 2 No 3 injector 15 No 4 injector 3 Fuel pressure control Ignition switch ON Battery voltage valve Engine Cranking to idling within abouttwo minutes 0 3 V to battery voltage 4 Stepper motor coil A1 Engine Immediately after engine has been started Changes repeatedly for warming up from battery voltage to 17 Stepper motor coil A2 0 6 V and from 0 6 V to battery voltage 5 Stepper motor coil B1 18 Stepper motor coil B2 6 Secondary air control Ignition switch ON Battery voltage solenoid valve 8 Fuel pump relay Ignition switch ON Battery voltage Engine Idling 0 3V 10 Power transistor unit Engine speed 3 000 r min 0 3 3 0 V A 23 Power transistor unit B 11 Wastegate solenoid Ignition switch ON Battery voltage valve Engine At idle after having been warmed up when 0 3 V premium gasoline is used 12 Power supply Ignition switch ON Battery voltage 25 19 Air flow sensor reset Engine Idling 0 1V signal Engine speed 3 000 r min 6 9V 20 Fan motor relay HI Fan not operating coolant temperature 90 C or Battery voltage Fan at high speed coolant temperature 105 C or above 0 3V MPI Troubleshooting 13 23
15. code output check engine lam TOME d 295 Engine warning lamp inspection items Engine ECU Air flow sensor AFS Intake air temperature sensor Throttle position sensor TPS Engine coolant temperature sensor Crank angle sensor Camshaft position sensor Barometric pressure sensor Detonation sensor Injector Ignition coil power transister Misfire lt Evolution V only gt 1 2 METHOD OF READING AND ERASING DIAGNOSIS CODES 1 Use the special tool to earth No 1 terminal diagnosis control terminal of the diagnosis connector 2 To check ABS system remove the valve relay NOTE That is because the valve relay is off and the warning lamp remains illuminated if there is a fault in the ABS system 3 Turn off the ignition switch 4 Read out a diagnosis code by observing how the warning lamp flashes Indication of diagnosis code by warning lamp When the diagnosis code No 24 is output When no diagnosis code is output 0 5 sec 1 5 secs 0 5 sec 0 5 sec lt MPI A T gt 0 2 5 sec lt ABS gt of gu bu a ecc m EERU UPE G time 3 division A03X0114 secs 2 secs A03X0113 NOTE Even if the ABS system is normal removing the valve relay causes the diagnosis code No 52 to be output MPI Troubleshooting 13 7 1 3 ERASING DIAGNOSIS CODES 1 Turn the ignition switch to OFF 2 After disco
16. earth Ignition switch ON Check trouble symptom OK System voltage Check the harness wire between the resistor and the injector connector and repair if necessary Malfunction of the injector Improper short circuited harness wire of the injector circuit connector contact open circuit Malfunction of the engine ECU NG gt Repair or MPI Troubleshooting 13 15 Code No 44 Ignition coil and power transistor unit system Probable cause Range of Check e Engine speed is approx 50 4 000 r min e Engine is not being cranked Set conditions e Abnormalengine speed is detected due to misfiring by crank angle sensor One e of two coils fails e Malfunction of the ignition coil e Improper connector contact open circuit or short circuited harness wire of the ignition primary circuit Malfunction of the engine ECU Check the ignition coil Refer to Group 16 Ignition System Measure at the ignition coil connectors A 110 111 e Disconnect the connector and measure at the harness 1 Voltage between 1 and earth Ignition switch ON OK System voltage 2 Voltage between 3 and earth Engine Cranking OK 05 40 3 Continuity between 2 and earth OK Continuity 1 NG Replace NG Check the following Repair connectors B 65 B 76 NG NG Check the following
17. position 4 all accessories OFF A C switch OFF ON Increases by 10 70 e Transmission Neutral steps e Idle position switch ON e Engine Idling When A C switch is ON A C A C switch OFF Increases by 5 50 compressor should be operat steps ing 49 A C relay Engine After having been warmed A C switch OFF OFF Compressor up Engine is idling clutch is not operating A C switch ON ON Compressor clutch is operating NOTE 1 The idle position switch normally turns off when the voltage of the throttle position sensor is 50 100 mV higher than the voltage at the idle position If the idle position switch turns back on after the throttle valve is opened the idle position switch and the throttle position sensor need to be adjusted 2 The injector drive time represents the time when the cranking speed is at 250 r min or below when the power supply voltage is 11 V 3 In a new vehicle driven approximately 500 km or less the injector drive time is sometimes 10 longer than the standard time 4 In a new vehicle driven approximately 500 km or less the step of the stepper motor is sometimes 30 steps greater than the standard value lt EVOLUTION V gt Descriptions other than those given below are the same as for the EVOLUTION IV MPI Troubleshooting 13 21 Item Inspection Inspection contents Normal condition No item 12 Air flow Engine cool
18. position sensor Gradually open Increases in proportion to throttle opening angle Open fully 4 500 5 500 mV 16 Power Ignition switch ON System voltage supply voltage 18 Cranking Ignition switch ON Engine Stopped OFF signal ignition Wn switch ST Engine Cranking ON NOTE When the car is new distance it travelled is less than become about 10 higher 500 km output frequency of the air flow sensor may MPI Troubleshooting 13 19 Item Inspection Inspection contents Normal condition No item 21 Engine Ignition switch ON or with engine When engine coolanttemper 20 C coolant running ature is 20 C temperature sensor When engine coolanttemper 0 C ature is 0 C When engine coolanttemper 20 C ature is 20 C When engine coolanttemper 40 C ature is 40 C When engine coolanttemper 80 C ature is 80 C 22 Crank angle Engine Idling When engine coolanttemper 1 300 1 500 rpm sensor e idle position switch ON ature is 20 C When engine coolanttemper 1 300 1 500 rpm ature is 0 C When engine coolanttemper 1 300 1 500 rpm ature is 20 C When engine coolanttemper 1 150 1 350 rpm ature is 40 C When engine coolanttemper 750 950 rpm ature is 80 C 25 Barometric Ignition switch ON At altitude of 0 m 101 kPa pressure sensor At altitude of 600 m 95 kPa At altitude of 1 200 m 88 kPa
19. 0 7FU2049 3 Perform the same steps from here on as with the 4G9 engine 7 2 CAMSHAFT POSITION SENSOR AND CRANK ANGLE SENSOR Perform the same steps as with the conventional 4G9 engine for the inspection 7 3 INJECTOR Observing waveforms displayed on the oscilloscope allows you to visually check the conditions of injector drive signals actually output from the engine ECU Oscilloscope gt lt aera ater I Oscilloscope Injector Control Signal Oscilloscope 1 lt Measurement procedure gt 1 Disconnect the injector connector and connect the special tool Test Harness MB991348 to the circuit Ensure that the terminals on both the power supply and engine ECU sides are connected 2 Connect the oscilloscope probe to terminal no 2 of injector connector NOTE 7FUO889 If the engine ECU connector is used for the measurement take measurements at each of the following terminals Connect the oscilloscope probe to terminal no 1 when the waveform is observed with no 1 cylinder to terminal no 14 when the waveform is observed with no 2 cylinder to terminal no 2 when the waveform is observed with no 3 cylinder and to terminal no 15 when the waveform is observed with no 4 cylinder MPI Troubleshooting 13 27 lt Standard waveform gt Observation conditions Probe selector switch x10 PointB Solenoid counter emf AC GND DC DC Ini approx 7 x 10 V PS VOLTS DIV
20. 00 r min or more e Improper connector contact open circuit Set conditions short circuited harness wire of the air flow sensor e Sensor output frequency is 3 Hz or less for 4 seconds e Malfunction of the engine ECU 1 NG Measureatthe air flow sensor con Check the air flow sensor circuit nector A 25 e Connect the connector Use the test harness MB991709 2 NG NG NG 1 Voltage between 3 and earth Measure at the engine ECU con Check the following connector Repair Engine Idling nector B 59 A 25 OK 2 2 3 2 V e Connect the connector OK 2 Voltage between 7 and earth e Voltage between 19 and earth OK 0 1 V Engine idling Ignition switch ON Check trouble symptom 6 9 V 2 000 r min OK 6 9 V NG yok OK T NG Replace the engine ECU Check the following connector Repair B 59 OK Replace the air flow sensor Check trouble symptom NG Y Replace the engine ECU MPI Troubleshooting 13 9 Probable cause Code No 13 Intake air temperature sensor system Range of Check Ignition switch ON e Excluding 60 seconds after the ignition switch after the engine starts Set conditions e Sensor output voltage is 4 6 V or more corresponding to an intake airtemperature of 45 C or less for 4 seconds or e Sensor output voltage is 0 2V or less correspon
21. 1 NG G Measure at the vehicle speed sensor connector A 19 m gt Check the following _ Repair e Disconnect the connector and measure at the harness side connectors 1 Voltage between 1 and earth Ignition switch ON 2 NG B 64 B 74 B 76 OK System voltage OK 2 Voltage between 3 and earth Ignition switch ON OK 48 52V 3 Continuity between 2 and earth 3 NG Check trouble symptom OK Continuity we NG or Check the harness wire Repair NG between the vehicle Check the following Repair speedsensor and ignition connectors switch connector A 19 B 62 OK Y Check the ignition switch Refer to GROUP 54 Ignition Switch Check trouble symptom NG NG Y NG Check the following Repair Check the harness wire Repair connector between the engine ECU B 62 and the vehicle speed OK sensor connector Y JoK Check trouble symptom NG Replace the engine ECU Y NG Check the harness wire Repair between the engine ECU and the vehicle speed sensor connector Replace the engine ECU Check the harness wire between the vehicle speed sensor and the earth and repair if necessary MPI Troubleshooting 13 13 Code No 25 Barometric pressure sensor system Probable cause Range of Check e Malfunction of the barometric pressure sensor e Ignition switch ON e Improper connector contact op
22. 13 1 FUEL CONTENTS MULTIPOINT INJECTION MPI TP 2 4 Fuel Pressure Measurement 30 5 MPI System Components Layout 31 GENERAL INFORMATION 2 6 Intake Air Temperature Sensor Check 32 SERVICE SPECIFICATIONS 3 7 Engine Coolant Temperature Sensor Check 5 2 ERIS AG 32 SEALANT RI Rena rne RR an 3 8 Oxygen Sensor Check 32 9 Injector Check 34 SPECIAL TOOLS dpi mque od 10 Resistor 34 TROUBLESHOOTING 6 11 Fuel Pump Relay No 2 Check 35 12 Fuel Pump Resistor Check 35 ON VEHICLE SERVICE 30 1 Idle Position Switch and Throttle Position INJECTOR een n 36 Sensor TPS Adjustment 30 2 Fixed SAS Adjustment 30 THROTTLE BODY 37 3 Basic Idle Speed Adjustment 30 13 2 MULTIPOINT INJECTION MPI GENERAL INFORMATION OMPI System Diagram MPI General Information 1 Oxygen sensor c Engine ECU X1 Injector X2 Air flow sensor 2 ISC servo Intake air temperature sensor x3 Fuel pressure control valve 4 Throttle position sensor x4 Waste gate solenoid valve 5 Idle switch x5 Secondary air control solenoid valve 6 Camshaft position sensor ee 7 Crank angle sensor e Control relay X8 Barometric pressure sensor e Fuel pump relay 9 Hig
23. C 0 30 0 42 at 80 C 3 Measure resistance while heating the sensor using a hair drier Normal condition Temperature C Resistance kQ Higher Smaller 4 f the value deviates from the standard value or the resistance remains unchanged replace the air flow sensor assembly 7 ENGINE COOLANT TEMPERATURE SENSOR CHECK The engine coolant temperature sensor is located as shown on the left Standard value 2 1 2 7 at 20 C 0 26 0 36 kQ at 80 C Engine coolant temperature sensor _ Oxygen senol egumen side PERM 8 OXYGEN SENSOR CHECK lt EVOLUTION IV gt J WA 1 4 gt R The sensor connector is located as shown on the left lt EVOLUTION V gt cu 1 Disconnect the oxygen sensor connector and connect 7 Oxygen Sensor the special tool Test Harness MD998464 to the oxygen sensor connector MPI On vehicle Service 13 33 2 Check that there is continuity 11 to 18 Q at 20 C across terminal no 1 special tool red clip and terminal no 3 Red clip special tool blue clip of the oxygen sensor connector 3 If there is no continuity replace the oxygen sensor 4 Run the engine until the engine coolant temperature exceeds 80 C 5 Using jumper wires connect oxygen sensor terminal no 1 special tool red clip and terminal no 3 special tool blue clip to battery and terminal respectively Y SS SY T Q p Make sure of the cor
24. Turn the A C switch ON Battery voltage A C compressor is oper ating 60 Oxygen sensor heater Engine Idling 0 3V Evolution V only Engine speed 5 000 r min Battery voltage 71 Ignition switch ST Engine Cranking 8 V or more 13 24 MPI Troubleshooting Terminal Check item Check condition Engine condition Normal condition No 72 Intake air temperature Ignition switch ON When intake air tempera 3 2 3 8 V sensor ture is 0 C When intake air tempera 2 3 2 9 V ture is 20 C When intake airtempera 1 5 2 1 V ture is 40 C When intake air tempera 0 4 1 0 V ture is 80 C 76 Oxygen sensor Engine Running at 2 000 r min after having been 0 0 8 V warmed up Check using a digital type voltmeter Changes repeatedly 80 Backup power supply Ignition switch OFF Battery voltage 81 Sensor impressed Ignition switch ON 4 5 5 5 V voltage 82 Ignition switch IG Ignition switch ON Battery voltage 83 Engine coolant Ignition switch ON When engine coolant 3 2 3 8 V temperature sensor temperature is 0 C When engine coolant 2 3 2 9 V temperature is 20 C When engine coolant 1 3 1 9 V temperature is 40 C When engine coolant 0 3 0 9 V temperature is 80 C 84 Throttle position sensor Ignition switch ON Set throttle valve to idle 0 3 1 0 V position Fully open throttle valve 4 5 5 5 V 85 Barometric pr
25. ant temperature Engine is idling 12 38 Hz o sensor 80 95 C Lamps electric cooling fan and 2 500 r min 36 76 Hz all accessories OFF Transmission Neutral Engine is raced Frequency increases in response to racing 41 Injector Engine Cranking When engine coolant temper 27 40 ms drive time ature is 0 C When engine coolant temper 14 5 21 7 ms ature is 20 C When engine coolant temper 3 8 5 6 ms ature is 80 C Injector Engine coolant temperature Engine is idling 0 9 2 1 ms drive time 3 80 95 C Lamps electric cooling fan and 2 500 r min 0 7 1 9 ms all accessories OFF Transmission Neutral When engine is suddenly Increases raced 44 Ignition Engine After having been Engine is idling 0 13 BTDC advance warmed up Timing lamp is set 2 500 r min 24 44 BTDC NOTE 1 In a new vehicle driven approximately 500 km or less the air flow sensor output 10 96 higher than the standard frequency 2 The injector drive time represents the time when the cranking speed is at 250 r min or below when the power supply voltage is 11 V 3 In a new vehicle driven approximately 500 km or less the injector drive time is sometimes 10 96 longer than the standard time frequency is sometimes 13 22 MPI Troubleshooting 6 ENGINE ECU INSPECTION 6 1 TERMINAL VOLTAGES Engine ECU connector 9FUO393
26. between 2 and earth Ignition switch ON nector B 62 OK 4 8 5 2 V 3 Continuity between 1 and earth 3 NG OK OK Continuity Check trouble symptom OK Y NG NG Check the following con Repair NG nector A 97 Check the harness wire Repair betweenthe engine ECU and yor the camshaft position sensor Check trouble symptom connector Replace the camshaft position sensor Replace Check the harness wire between the camshaft position sensor and the earth and repair if necessary 13 12 MPI Troubleshooting Code No 24 Vehicles speed sensor system Probable cause Range of check e Malfunction of the vehicle speed sensor e Ignition switch ON e Improper connector contact open circuit or e Excluding 60 seconds after the ignition switch is turned to ON or immediately short circuited harness wire of the vehicle speed after the engine starts sensor circuit idle position switch OFF e Malfunction of the engine ECU e Engine speed is 3 000 r min or more e Driving under high engine load conditions Set conditions e Sensor output voltage does not change for 4 seconds no pulse signal input NG Check the vehicle speed sensor Refer to GROUP 54 Combina Replace tion Meters
27. cle Service 13 35 11 FUEL PUMP RELAY NO 2 CHECK 1 Remove fuel pump relay No 2 Fuel pump relay No 2 um s ia 6FU2665 2 Using jumper wires connect fuel pump relay No 2 terminal 3 to battery terminal and terminal 1 to battery terminal respectively 3 Connecting and disconnecting the jumper wire on the battery terminal end check for continuity across terminal 2 and terminal 5 and across terminal 4 and terminal 5 of fuel pump relay No 2 Jumper wire Continuity across Continuity across terminals 2 and b terminals 4 and 5 Connected No Yes Disconnected Yes No 4 If the continuity is checked abnormally replace fuel pump relay No 2 12 FUEL PUMP RESISTOR CHECK 1 Disconnect the fuel pump resistor connector e Z VATY y AZ Fuel pump resistor 6FU2666 2 Measure resistance across the terminals Standard value 0 6 0 9 Q 3 If the measurement falls outside the specified range replace the fuel pump resistor 13 36 MPI Injector INJECTOR REMOVAL AND INSTALLATION Pre removal Operation Post installation Operation 1 Fuel Discharge Prevention 1 Air Hose D Installation 2 Air Hose D Removal Refer to GROUP15 Intercooler Refer to GROUP15 Intercooler 2 Fuel Leakage Check 12 Engine oil 03Z0084 9 0 9 O3M0069 Unit Nm kgf
28. ding to an intake air temperature of 125 C or more for 4 seconds e e is turned to ON or immediately Malfunction of the intake air temperature sensor Improper connector contact open circuit or short circuited harness wire of the intake air temperature sensor circuit Malfunction of the engine ECU NG m Repair NG m gt Repair NG Check the intake air temperature sen Replace air flow sensor Sor Refer to P 13 32 JOK NG Measure atthe air flow sensor connec Check the following connector tor A 25 C 62 e Disconnect the connector and OK measure at the harness side Y e Voltage between 6 and earth heck Ignition switch Check tr uble symptom OK 4 5 4 9 V NG e Continuity between 5 and earth t OK Continuity Check the harness wire between the engine ECUand the intake air temper OK ature sensor connector T NG 2 Check the following connector Repair A 25 OK T NG Check trouble symptom I Replace the engine ECU Probable cause Code No 14 Throttle position sensor TPS system Probable cause Code No 14 Throttle position sensor TPS system Range of Check e Ignition switch ON e Excluding 60 seconds after the ignition switch is turned to ON or immediately after the engine starts Set conditions e The sensor outpu
29. e drop caused by resistance of the resistor As the amount of current increases voltage gradually decreases and a spike occurs at the plunger fully opened position due to counter emf lt Waveform observation points gt Point A Voltage drop during fuel injection time Refer to abnormal waveform example 1 Difference from standard waveform Possible cause Voltage drop during fuel injection time is small there Resistance of resistor is too small Resistance of injector should normally be a voltage drop of about 10 V is too large Point B Spike when plunger is fully open Refer to abnormal waveform example 2 Difference from standard waveform Possible cause No spike when plunger is fully open Plunger inoperative lt Abnormal waveform examples gt e Example 1 Cause of problem Resistance of the resistor is too small Waveform characteristics Small voltage drop Abnormal waveform Normal waveform e Example 2 Cause of problem Plunger is inoperative Waveform characteristics No spike when plunger is fully open 01P0205 7 4 IGNITION COIL Perform the same steps as with the conventional 4G9 engine for the inspection 13 30 MPI On vehicle Service ON VEHICLE SERVICE 1 IDLE POSITION SWITCH AND THROTTLE POSITION SENSOR TPS ADJUSTMENT The thickness of the feeler gauge inserted between the fixed SAS and throttle lever should be 0 45 mm 2 FIXED SAS ADJUSTMENT lt EVOLUTION IV gt
30. e following connector B 62 NG Check the harness wire between the detonationsensor and earth and repair if necessary Code No 41 Injector system I gt Repair OK Y Check trouble symptom NG Check the harness wire between the Replace the detonation sensor engine ECU and the detonation sensor connector Y Ne Check trouble symptom Repair ye Replace the engine ECU Probable cause Range of Check e Engine speed is approx 50 1 000 r min e The throttle position sensor output voltage is 1 15 V or less Set conditions e Surge voltage of injector coil is not detected for 4 seconds Check the injector Refer to P 13 34 Check the resistor Refer to P 13 34 Check the injector control circuit NG I Replace NG Measure at the resistor connector Check the harness wire between the A 125 control relay and the resistor connec e Disconnect the connector and tor and repair if necessary measure at the harness side e Voltage between and earth Ignition switch ON OK System voltage NG Measure at the injector connectors Check the following connector A 53 A 54 A 55 A 56 A 125 e Disconnect the connector and OK measure at the harness side Y e Voltage between 1 and
31. ecifications Sealant 13 3 SERVICE SPECIFICATIONS Items Specifications Basic ignition timing BTDC 5 3 Basic idle speed rpm 850 50 Throttle position sensor adjusting voltage mV 400 1 000 Throttle position sensor resistance kQ 3 5 6 5 ISC servo coil resistance at 20 C Q 28 33 Intake air temperature sensor resistance kQ At 20 C 2 3 3 0 At 80 C 0 30 0 42 Coolant temperature sensor resistance kQ At 20 C 2 1 2 7 At 80 C 0 26 0 36 Fuel pressure When vacuum hose is connected 230 2 35 kPa kgf cm When vacuum hose is disconnected 289 309 2 95 3 15 Injector coil resistance 2 3 Amount of injector fuel leak drop min 1 or less Oxygen sensor output voltage 0 6 1 0 Fuel pressure control valve coil resistance at 20 C Q 28 36 SEALANT Item Specified sealant Coolant temperature sensor Drying sealant HELMESEAL H 1M 0110513 NOTE Given in are MITSUBISHI GENUINE PART numbers 13 4 MPI Special Tools SPECIAL TOOLS Tool Number Name Use MB991348 Test harness set e Measurement of voltage during trouble shooting e Inspection using an oscilloscope MB991519 Alternator harness Measurement of voltage during connector troubleshooting MB991536 TPS check Adjustment of idle switch and throttle position harness sensor TPS MD998464 Test harness Inspection of oxygen sensor 4 pin square
32. en circuit or e Excluding 60 seconds after the ignition switch is turned to ON or immediately short circuitedharness wire of the barometric pressure after the engine starts sensor circuit Set conditions e Malfunction of the engine ECU e Sensor output voltage is 4 5 V or more corresponding to a barometric pressure of 114 kPa 855 mmHg or more for 4 seconds or e Sensor output voltage is 0 2 V or less corresponding to a barometric pressure of 53 kPa 40 mmHg or less for 4 seconds NG NG NG Measureatthe air flow sensor con Measureatthe air flow sensor con Check the following connector Repair nector A 25 nector A 25 B 62 e Connect the connector Use e Disconnectthe connector and OK the test harness MB991709 measure at the harness side e Voltage between 2 and earth e Voltage between 1 and earth Ignition switch ON Ignition switch ON Check symptom OK 3 7 4 3V Altitude 0 m OK 4 8 5 2 V NG 3 2 3 8 V e Continuitybetween5 andearth NG Altitude 1 200 OK Continuity Check the harness wire between Repair OK the engine ECU and the baromet OK ric pressure sensor connector NG OK Check the following connector Repair A 25 Replace the engine ECU NG NG Check trouble symptom gt Check the harness wire between
33. essure Ignition switch ON When altitude is 0 m 3 7 4 3 V sensor When altitude is 1 200m 3 2 3 8 V 86 Vehicle speed sensor e ignition switch ON 05V e Move the vehicle slowly forward Changes repeatedly 87 Idle position switch Ignition switch ON Set throttle valve to idle O 1V position Slightly open throttle 4 V or more valve 88 Camshaft position Engine Cranking 0 4 3 0 V sensor Engine Idle speed 0 5 2 0 V 89 Crank angle sensor Engine Cranking 04 40 V Engine Idle speed 1 5 2 5V 90 Air flow sensor Engine Idle speed 2 2 3 2V Engine speed 2 500 r min 6 2 RESISTANCE AND CONTINUITY BETWEEN HARNESS SIDE CONNECTORS AND TERMINALS MPI Troubleshooting Engine ECU Harness Side Connector Terminal Arrangement 9FUO392 13 25 Terminal No Inspection item Normal condition Check condition 1 12 No 1 injector 2 30 At 20 C 14 12 No 2 injector 2 12 No 3 injector 15 12 No 4 injector 3 12 Fuel pressure control valve 28 36 Q At 20 C 4 12 Stepper motor coil A1 28 33 At 20 C 17 12 Stepper motor coil A2 5 12 Stepper motor coil B1 18 12 Stepper motor coil B2 Secondary air control solenoid valve 28 36 Q At 20 C Wastegate solenoid valve 62 74 Q At 20 C 13 Body earth 26 Body earth Engine ECU earth Continuity established 0 Q 60 12 Oxygen sensor heater EVOLUTION V only 11 18 0 at 20 C
34. h temperature sensor e relay 10 Engine coolant temperature sensor e Ignition coil 11 Detonation sensor e Exhaust temperature warning lamp p locos co eue OS e Engine warning lamp e Power supply voltage e Diagnosis output e ignition switch IG e Alternator G terminal e Ignition switch ST e Fan motor relay e Vehicle speed sensor e Tachometer e A C switch e Fuel pump relay No 2 e Power steering fluid pressure switch e Alternator FR signal From x2 ISC servo fuel Throttle position Canister tank sensor with a Check valve ae x5 Secondary air JAS Switch jp control solenoid valve i e Secondary air valve pressure regulator X8 Barometric x3 Fuelpressure control valve From fuel pump 9 pressure sensor X3 X2 Airflow sensor Intake air tem Air D H a Waste gate actuator H 6 Camshaft position 7 Sere 1 Injector Crank angle sensor 11 Detonation sensor 9 High temperature sensor x4 Waste gate solenoid valve Given above is the MPI system diagram for EVOLUTION IV The MPI system for EVOLUTION V is different from this in the following point e Oxygen sensor with a heater is adopted e The diagnosis connector power supply circuit is different e The high temperature sensor is no longer used Catalytic converter 6FU2656 MPI Service Sp
35. ng racing 010202 MPI Troubleshooting Injector Power Supply Voltage Oscilloscope 2 lt Measurement procedure gt the waveform is observed with no 4 cylinder 3 For the power supply voltage observe the waveform of the injector control signal at the same time Refer to P 13 26 for the injector control signal measurement procedure lt Standard waveform gt Observation conditions Injector power supply voltage waveform Injector control signal Probe selector switch x1 x 10 AC GND DC AC DC VOLTS DIV 5V 1V TIME DIV 0 5 ms Misc To be timed with injector control signal Engine speed Idle 850 rpm Plunger in fully opened position Injector power supply voltage waveform oscilloscope 2 5 Injector control signal waveform oscilloscope 1 es Fuel injection time L Time 7FUO975 1 Disconnect the resistor connector and connect the special tool Harness Connector MD998463 to the circuit 2 Connect the oscilloscope probe to resistor connector terminal 1 special tool red clip when the waveform is observed with no 1 cylinder to terminal 4 black clip when the waveform is observed with no 2 cylinder to terminal 5 green clip when the waveform is observed with no 3 cylinder and to terminal 6 yellow clip when MPI Troubleshooting 13 29 lt Explanation of waveform gt The injector power supply voltage waveform shows a voltag
36. nnecting the battery cable from the battery terminal for 10 seconds or more reconnect the cable 3 After the engine has warmed up run it at idle for about 15 minutes 1 4 FAIL SAFE FUNCTION REFERENCE TABLE When the main sensor malfunctions are detected by the diagnosis function the vehicle is controlled by means of the pre set control logic to maintain safe conditions for driving Malfunctioning item Control contents during malfunction Air flow sensor AFS 1 Uses the throttle position sensor signal and engine speed signal crank angle sensor signal to take reading of the basic injector drive time and basic ignition timing from the pre set mapping 2 Fixes the ISC servo in the appointed position so idle control is not performed Intake air temperature sensor Controls as if the intake air temperature is 25 C Throttle position sensor TPS No increase in fuel injection amount during acceleration due to the throttle position sensor signal Engine coolant temperature sensor Controls as if the engine coolant temperature is 80 C This condition is maintained until the ignition switch is turned off even when the sensor signal returns normal Camshaft position sensor 1 Injects fuel to all cylinders simultaneously for 4 seconds However after the ignition switch is turned to ON the No 1 cylinder top dead centre is not detected at all 2 Lets the fan motor radiator and conden
37. orrect idle speed The engine doesn t idle at the usual correct speed Engine stall The engine stalls when the accelerator pedal is released regardless of whether Die out the vehicles is moving or not Engine stall The engine stalls when the accelerator pedal is depressed or while it is being Pass out used Driving Hesitation Sag Hesitation is the delay in response of the vehicle speed engine speed that occurs when the accelerator is depressed in order to accelerate from the speed at which the vehicle is now traveling or a temporary drop in vehicle speed engine speed during such acceleration Serious hesitation is called sag Refer to Figure 1 Poor acceleration Poor acceleration is inability to obtain an acceleration corresponding to the degree of throttle opening even though acceleration is smooth or the inability to reach maximum speed Stumble Engine speed increase is delayed when the accelerator pedal is initially depressed for acceleration Refer to Figure 2 Shock The feeling of a comparatively large impact or vibration when the engine is accelerated or decelerated Surge This is repeated forward or rearward surging during constant speed travel or during variable speed travel Knocking A sharp sound like a hammer striking the cylinder walls during driving and which adversely affects driving Stopping Run on The condition in which the engine continues to run after the ignition switch is Dieseling turned to OFF
38. r circuit Set conditions e Malfunction of the engine ECU e Sensor output voltage is 4 6 V or more corresponding to an engine coolant temperature of 45 C or less for 4 seconds or e Sensor output voltage is 0 1 V or less corresponding to an engine coolant temperature of 140 C or more for 4 seconds Range of Check e Ignition switch ON e Engine speed is approx 50 r min or more Set conditions e The sensor output voltage increases from 1 6 V or less corresponding to an engine coolant temperature of 40 C or more to 1 6 V or more corresponding to an engine coolant temperature of 40 C or less After this the sensor output voltage is 1 6 V or more for 5 minutes N Checkthe engine coolant temperature Replace sensor Refer to P 13 32 yok NG NG Measureatthe engine coolanttemper Check the following connector Repair ature sensor connector A 38 B 62 e Disconnect the connector and OK measure at the harness side e Voltage between 1 and earth Ignition switch ON Check trouble symptom OK 4 5 4 9 V NG Continuity between 2 and earth Y OK Continuity Check the harness wire between the Repair engine ECU and the engine coolant OK temperature sensor connector Y NG OK Check the following connector amp Repair A 38 OK Y NG Check trouble symptom Replace the engine ECU
39. rect connections if a wrong connection is made a broken oxygen sensor results RIE 6 Connect a digital voltmeter between terminal 2 special E tool black clip and terminal no 4 special tool white clip 7 Race the engine repeatedly to measure the oxygen sensor output voltage Standard value Engine Oxygen sensor NOTE output voltage When 0 6 1 0V When engine racing is engine is repeated to enrich air fuel raced ratio an operational oxygen sensor should output a volt age of 0 6 to 1 0 V NOTE Use the same procedures to remove and install the oxygen sensor 13 34 MPI On vehicle Service 9 INJECTOR CHECK Injection Condition Check 1 Release the residual pressure from the fuel pipe line to prevent fuel from flowing out 2 Remove the injector 3 Set up the special tools Injector Test Set Adapter Fuel Pressure Regulator and Clip as illustrated below 4 From here on use the same procedure as with the conventional 4G9 engine for the check Main hose MD998741 Return hose MB991607 Fuel Pressure Regulator MD116395 MD998706 Clip MD998746 Injector 7FUO145 Battery 10 RESISTOR CHECK 1 Disconnect the resistor connector 2 Measure resistance across terminals as detailed below Standard value Measurement terminals Resistance Q 1 3 4 3 5 5 to 6 5 at 20 C 5 3 6 3 6FU2097 MPI On vehi
40. sor run at high speed Barometric pressure sensor Controls as if the barometric pressure is 101 kPa 760 mmHg Detonation sensor Switches the ignition timing from ignition timing for super petrol to ignition timing for standard petrol Ignition coil power transistor Cuts off the fuel supply to cylinders with an abnormal ignition Alternator FR terminal Does not control the output of the alternator according to an electrical load works as a normal alternator Misfire Evolution V only Cuts off the fuel to the misfiring cylinder if a misfire that could damage the catalyst is detected 13 8 MPI Troubleshooting 2 INSPECTION CHART FOR DIAGNOSIS CODES Code No Diagnosis item Reference page 12 Air flow sensor AFS system 13 8 13 Intake air temperature sensor system 13 9 14 Throttle position sensor TPS system 13 9 21 Engine coolant temperature sensor system 13 10 22 Crank angle sensor system 13 11 23 Camshaft position sensor system 13 11 24 Vehicle speed sensor system 13 12 25 Barometric pressure sensor system 13 13 31 Detonation sensor system 13 14 41 Injector system 13 14 44 Ignition coil and power transistor unit system 13 15 64 Alternator FR terminal system 13 16 3 INSPECTION PROCEDURE FOR DIAGNOSIS CODES Code No 12 Air flow sensor AFS system Probable cause Range of Check e Malfunction of the air flow sensor e Engine speed is 5
41. t voltage is 0 2 V or less for 4 seconds Malfunction of the throttle position sensor Improper connector contact open circuit or short circuited harness wire of the throttle position sensor circuit Improper ON state of idle position switch Short circuit of the idle position switch signal line Malfunction of the engine ECU NG Check the throttle position sensor yok NG Measure at the throttle position sensor connector A 16 e Disconnect the connector and measure at the harness side Voltage between 1 and earth Ignition switch ON OK 4 8 5 2 V Continuity between 4 and earth OK Continuity Check the throttle position sensor out put circuit Replace NG Check the following connector B 62 m Repair OK Y Check trouble symptom NG Y NG Check the harness wire between the engine ECU and the throttle position sensor connector gt Repair Replace the engine ECU 13 10 MPI Troubleshooting Code No 21 Engine coolant temperature sensor system Probable cause Range of Check e Malfunction of the engine coolant temperature sensor e Ignition switch ON e Improper connector contact open circuit e Excluding 60 seconds after the ignition switch is turned to ON or immediately short circuited harness wire of the engine coolant after the engine starts temperature senso
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